The 2021 League of Legends World Championship was an esports tournament for the multiplayer online battle arena video game League of Legends. It was the eleventh iteration of the League of Legends World Championship, an annual international tournament organized by the game's developer, Riot Games. The tournament was held from 5 October to 6 November in Reykjavík, Iceland.^[2] Twenty two teams from 11 regions qualified for the tournament based on their placement in regional circuits such as those in China, Europe, North America, South Korea and Taiwan/Hong Kong/Macau/Southeast Asia with ten of those teams having to reach the main event via a play-in stage.

"Burn It All Down" was the tournament's theme song, put together by PVRIS, while Denzel Curry, CIFIKA, Besomorph, and Wang Yibo from Uniq, produced their own respective remix versions of "Burn It All Down".^[3][4]

Edward Gaming of China's LPL defeated the defending world champions, DWG KIA of Korea's LCK, to win their first World Championship title.

The COVID-19 pandemic, which was mainly confined to China in January and early February 2020, once again affected the scheduled multi-city hosting format that was most recently present for the 2019 League of Legends World Championship. On June 16, Riot Games originally announced the dates and locations of the event, with the event taking place in Shanghai, Qingdao, Wuhan, Chengdu, and the finals taking place in Shenzhen.^[5][6] However, due to travel complications arising from the COVID-19 pandemic in mainland China, Riot Games announced Reykjavík, Iceland (where the 2021 Mid-Season Invitational had been hosted), as the new host city for the event.^[7]

Due to complications arising from the COVID-19 pandemic in Vietnam, two teams from the VCS (Vietnam) were once again unable to participate in the tournament.^[8]

Like the 2020 event, the tournament did not feature a live audience as result of the pandemic.^[9]

South Korea (LCK) and China (LPL) received an additional spot in the group stage, totaling up to four representatives each for their respective region. The qualification format for North America (LCS) changed to a one-season-per-year system, with the seeding decided by the cumulative scoreboard from the whole season and the results from their respective championship series.

Due to Vietnam (VCS) being unable to field teams for the event, the third seed from Europe (LEC) received direct entry into the group stage.^[10]

Top 4 regions in 2021 Mid-Season Invitational (LPL, LCK, LEC, PCS) are seeded to pool 1 in the main event's group stage for the summer champion.

Reykjavík was the city chosen to host the competition. All matches were played at Laugardalshöll without spectators.^[2]

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Reykjavík, Iceland
Laugardalshöll
Reykjavík

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• Date and time: October 11–18, began at 11:00 UTC.
• Sixteen teams are drawn into four groups with four teams in each group based on their seeding. Teams of the same region cannot be placed in the same group.
• Double round robin, all matches are best-of-one.
• If teams have the same win–loss record and head-to-head record, tiebreaker matches are played for first or second place. If more than 2 teams, tiebreaker placement is based on the combined times of teams' victorious games.
• Top two teams will advance to Knockout Stage. Bottom two teams are eliminated.

• Date and time: 22 October–6 November, time for all matches 12:00 UTC.
• Eight teams are drawn into a single elimination bracket.
• All matches are best-of-five.
• The first-place team of each group is drawn against the second-place team of a different group.
• The first-place team chooses the side for the first games, loser of the previous game chooses the side for the next game.
• Teams from same group will be on opposite sides of the bracket, meaning they cannot play each other until the Finals.